Perhaps you should try some spelling variations:
complex services » composed services, complex surfaces, compute services
complex service » computer service, compute service, component service
complex series » complex queries, complete series, compleat series

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: the ((complex series) OR (((complex services) OR (complex service)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "the ((complex series) or (((complex services) OR (complex service))))".
• Adding a wildcard symbol may retrieve word variants: the ((complex series) or (((complex services) OR (complex service))))*.